1

GATE ECE 2015 Set 1

Numerical

+1

-0

A silicon sample is uniformly doped with donor type impurities with a concentration of $$10^{16}/cm^3$$.The electron and hole mobilities in the sample are
$$1200\;cm^2/V-s$$ and $$400\;cm^2/V-s$$ respectively. Assume complete ionization of impurities.
The charge of an electron is $$1.6\;\times\;10^{-19}\;C$$.The resistivity of the sample
$$\left(in\;\Omega-cm\right)$$ is _____________.

Your input ____

2

GATE ECE 2014 Set 4

MCQ (Single Correct Answer)

+1

-0.3

In the figure ln(ρ

_{i}) is plotted as a function of 1/T, where ρ_{i}the intrinsic resistivity of silicon, T is is the temperature, and the plot is almost linear.The slope of the line can be used to estimate

3

GATE ECE 2014 Set 4

Numerical

+1

-0

The cut-off wavelength (in µm) of light that can be used for intrinsic excitation of a
semiconductor material of bandgap E

_{g}= 1.1 eV is ________.Your input ____

4

GATE ECE 2014 Set 3

MCQ (Single Correct Answer)

+1

-0.3

A thin P-type silicon sample is uniformly illuminated with light which generates excess
carriers. The recombination rate is directly proportional to

Questions Asked from Semiconductor Physics (Marks 1)

Number in Brackets after Paper Indicates No. of Questions

GATE ECE 2024 (2)
GATE ECE 2023 (2)
GATE ECE 2022 (2)
GATE ECE 2017 Set 1 (1)
GATE ECE 2016 Set 1 (1)
GATE ECE 2015 Set 2 (2)
GATE ECE 2015 Set 1 (1)
GATE ECE 2014 Set 4 (2)
GATE ECE 2014 Set 3 (2)
GATE ECE 2011 (1)
GATE ECE 2008 (1)
GATE ECE 2006 (2)
GATE ECE 2005 (3)
GATE ECE 2004 (1)
GATE ECE 2003 (1)
GATE ECE 2002 (2)
GATE ECE 1997 (1)
GATE ECE 1995 (3)
GATE ECE 1994 (2)

GATE ECE Subjects

Signals and Systems

Representation of Continuous Time Signal Fourier Series Fourier Transform Continuous Time Signal Laplace Transform Discrete Time Signal Fourier Series Fourier Transform Discrete Fourier Transform and Fast Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Discrete Time Linear Time Invariant Systems Transmission of Signal Through Continuous Time LTI Systems Sampling Transmission of Signal Through Discrete Time Lti Systems Miscellaneous

Network Theory

Control Systems

Digital Circuits

General Aptitude

Electronic Devices and VLSI

Analog Circuits

Engineering Mathematics

Microprocessors

Communications

Electromagnetics